下列Eloquent ORM更新删除操作中哪个语句是错误的?
A.
$student = Student::find(5); $bool = $student->delete();
B.
$num = Student::destroy([5, 6, 7]);
C.
//更新操作 $student = Student::find(5); $student->name = '四';
D.
$num = Student::where('id', '>', 6)->update( ['sex'=>'男', 'age'=>41] );